Fixes #29819 - Support byos images on azurerm

app/models/concerns/foreman_azure_rm/vm_extensions/managed_vm.rb

@@ -59,9 +59,27 @@ def define_data_disks(vm_name, data_disks)
         end
       end
 
+      def marketplace_image_plan(image)
+        image_type, image_id = image.split('://')
+        if image_type == "marketplace"
+          urn = image_id.split(':')
+          publisher = urn[0]
+          offer     = urn[1]
+          sku       = urn[2]
+          version   = urn[3]
+
+          image_plan = ComputeModels::PurchasePlan.new
+          image_plan.publisher = publisher.downcase
+          image_plan.name = sku.downcase
+          image_plan.product = offer.downcase
+          image_plan
+        end
+        image_plan
+      end
+
       def marketplace_image_reference(publisher, offer, sku, version)
         image_reference = ComputeModels::ImageReference.new
-        image_reference.publisher = publisher
+        image_reference.publisher = publisher.downcase
         image_reference.offer = offer
         image_reference.sku = sku
         image_reference.version = version
@@ -209,6 +227,7 @@ def initialize_vm(vm_hash)
 
       def create_managed_virtual_machine(vm_hash)
         vm_params = initialize_vm(vm_hash)
+        vm_params.plan = marketplace_image_plan(vm_hash[:image_id])
         vm_params.network_profile = define_network_profile(vm_hash[:network_interface_card_ids])
         vm_params.storage_profile.image_reference = define_image(vm_hash[:resource_group], vm_hash[:image_id])
         vm_params.storage_profile.data_disks = define_data_disks(vm_hash[:name], vm_hash[:data_disks])